# copyright (c) 2022 PaddlePaddle Authors. All Rights Reserve.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys
import tarfile
import os
import time
import datetime
import functools
import cv2
import platform
import numpy as np
from paddle.utils import try_import

fitz = try_import("fitz")
from PIL import Image
from pdf2docx.converter import Converter
from qtpy.QtWidgets import (
    QApplication,
    QWidget,
    QPushButton,
    QProgressBar,
    QGridLayout,
    QMessageBox,
    QLabel,
    QFileDialog,
    QCheckBox,
)
from qtpy.QtCore import Signal, QThread, QObject
from qtpy.QtGui import QImage, QPixmap, QIcon

file = os.path.dirname(os.path.abspath(__file__))
root = os.path.abspath(os.path.join(file, "../../"))
sys.path.append(file)
sys.path.insert(0, root)

from ppstructure.predict_system import StructureSystem, save_structure_res
from ppstructure.utility import parse_args, draw_structure_result
from ppocr.utils.network import download_with_progressbar
from ppstructure.recovery.recovery_to_doc import sorted_layout_boxes, convert_info_docx

# from ScreenShotWidget import ScreenShotWidget

__APPNAME__ = "pdf2word"
__VERSION__ = "0.2.2"

URLs_EN = {
    # 下载超英文轻量级PP-OCRv3模型的检测模型并解压
    "en_PP-OCRv3_det_infer": "https://paddleocr.bj.bcebos.com/PP-OCRv3/english/en_PP-OCRv3_det_infer.tar",
    # 下载英文轻量级PP-OCRv3模型的识别模型并解压
    "en_PP-OCRv3_rec_infer": "https://paddleocr.bj.bcebos.com/PP-OCRv3/english/en_PP-OCRv3_rec_infer.tar",
    # 下载超轻量级英文表格英文模型并解压
    "en_ppstructure_mobile_v2.0_SLANet_infer": "https://paddleocr.bj.bcebos.com/ppstructure/models/slanet/en_ppstructure_mobile_v2.0_SLANet_infer.tar",
    # 英文版面分析模型
    "picodet_lcnet_x1_0_fgd_layout_infer": "https://paddleocr.bj.bcebos.com/ppstructure/models/layout/picodet_lcnet_x1_0_fgd_layout_infer.tar",
}
DICT_EN = {
    "rec_char_dict_path": "en_dict.txt",
    "layout_dict_path": "layout_publaynet_dict.txt",
}

URLs_CN = {
    # 下载超中文轻量级PP-OCRv3模型的检测模型并解压
    "cn_PP-OCRv3_det_infer": "https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_det_infer.tar",
    # 下载中文轻量级PP-OCRv3模型的识别模型并解压
    "cn_PP-OCRv3_rec_infer": "https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_rec_infer.tar",
    # 下载超轻量级英文表格英文模型并解压
    "cn_ppstructure_mobile_v2.0_SLANet_infer": "https://paddleocr.bj.bcebos.com/ppstructure/models/slanet/en_ppstructure_mobile_v2.0_SLANet_infer.tar",
    # 中文版面分析模型
    "picodet_lcnet_x1_0_fgd_layout_cdla_infer": "https://paddleocr.bj.bcebos.com/ppstructure/models/layout/picodet_lcnet_x1_0_fgd_layout_cdla_infer.tar",
}
DICT_CN = {
    "rec_char_dict_path": "ppocr_keys_v1.txt",
    "layout_dict_path": "layout_cdla_dict.txt",
}


def QImageToCvMat(incomingImage) -> np.array:
    """
    Converts a QImage into an opencv MAT format
    """

    incomingImage = incomingImage.convertToFormat(QImage.Format.Format_RGBA8888)

    width = incomingImage.width()
    height = incomingImage.height()

    ptr = incomingImage.bits()
    ptr.setsize(height * width * 4)
    arr = np.frombuffer(ptr, np.uint8).reshape((height, width, 4))
    return arr


def readImage(image_file) -> list:
    if os.path.basename(image_file)[-3:] == "pdf":
        imgs = []
        with fitz.open(image_file) as pdf:
            for pg in range(0, pdf.pageCount):
                page = pdf[pg]
                mat = fitz.Matrix(2, 2)
                pm = page.getPixmap(matrix=mat, alpha=False)

                # if width or height > 2000 pixels, don't enlarge the image
                if pm.width > 2000 or pm.height > 2000:
                    pm = page.getPixmap(matrix=fitz.Matrix(1, 1), alpha=False)

                img = Image.frombytes("RGB", [pm.width, pm.height], pm.samples)
                img = cv2.cvtColor(np.array(img), cv2.COLOR_RGB2BGR)
                imgs.append(img)
    else:
        img = cv2.imread(image_file, cv2.IMREAD_COLOR)
        if img is not None:
            imgs = [img]

    return imgs


class Worker(QThread):
    progressBarValue = Signal(int)
    progressBarRange = Signal(int)
    endsignal = Signal()
    exceptedsignal = Signal(str)  # 发送一个异常信号
    loopFlag = True

    def __init__(self, predictors, save_pdf, vis_font_path, use_pdf2docx_api):
        super(Worker, self).__init__()
        self.predictors = predictors
        self.save_pdf = save_pdf
        self.vis_font_path = vis_font_path
        self.lang = "EN"
        self.imagePaths = []
        self.use_pdf2docx_api = use_pdf2docx_api
        self.outputDir = None
        self.totalPageCnt = 0
        self.pageCnt = 0
        self.setStackSize(1024 * 1024)

    def setImagePath(self, imagePaths):
        self.imagePaths = imagePaths

    def setLang(self, lang):
        self.lang = lang

    def setOutputDir(self, outputDir):
        self.outputDir = outputDir

    def setPDFParser(self, enabled):
        self.use_pdf2docx_api = enabled

    def resetPageCnt(self):
        self.pageCnt = 0

    def resetTotalPageCnt(self):
        self.totalPageCnt = 0

    def ppocrPrecitor(self, imgs, img_name):
        all_res = []
        # update progress bar ranges
        self.totalPageCnt += len(imgs)
        self.progressBarRange.emit(self.totalPageCnt)
        # processing pages
        for index, img in enumerate(imgs):
            res, time_dict = self.predictors[self.lang](img)

            # save output
            save_structure_res(res, self.outputDir, img_name)
            # draw_img = draw_structure_result(img, res, self.vis_font_path)
            # img_save_path = os.path.join(self.outputDir, img_name, 'show_{}.jpg'.format(index))
            # if res != []:
            #     cv2.imwrite(img_save_path, draw_img)

            # recovery
            h, w, _ = img.shape
            res = sorted_layout_boxes(res, w)
            all_res += res
            self.pageCnt += 1
            self.progressBarValue.emit(self.pageCnt)

        if all_res != []:
            try:
                convert_info_docx(imgs, all_res, self.outputDir, img_name)
            except Exception as ex:
                print(
                    "error in layout recovery image:{}, err msg: {}".format(
                        img_name, ex
                    )
                )
        print("Predict time : {:.3f}s".format(time_dict["all"]))
        print("result save to {}".format(self.outputDir))

    def run(self):
        self.resetPageCnt()
        self.resetTotalPageCnt()
        try:
            os.makedirs(self.outputDir, exist_ok=True)
            for i, image_file in enumerate(self.imagePaths):
                if not self.loopFlag:
                    break
                # using use_pdf2docx_api for PDF parsing
                if self.use_pdf2docx_api and os.path.basename(image_file)[-3:] == "pdf":
                    self.totalPageCnt += 1
                    self.progressBarRange.emit(self.totalPageCnt)
                    print("===============using use_pdf2docx_api===============")
                    img_name = os.path.basename(image_file).split(".")[0]
                    docx_file = os.path.join(self.outputDir, "{}.docx".format(img_name))
                    cv = Converter(image_file)
                    cv.convert(docx_file)
                    cv.close()
                    print("docx save to {}".format(docx_file))
                    self.pageCnt += 1
                    self.progressBarValue.emit(self.pageCnt)
                else:
                    # using PPOCR for PDF/Image parsing
                    imgs = readImage(image_file)
                    if len(imgs) == 0:
                        continue
                    img_name = os.path.basename(image_file).split(".")[0]
                    os.makedirs(os.path.join(self.outputDir, img_name), exist_ok=True)
                    self.ppocrPrecitor(imgs, img_name)
                # file processed
            self.endsignal.emit()
            # self.exec()
        except Exception as e:
            self.exceptedsignal.emit(str(e))  # 将异常发送给UI进程


class APP_Image2Doc(QWidget):
    def __init__(self):
        super().__init__()
        # self.setFixedHeight(100)
        # self.setFixedWidth(520)

        # settings
        self.imagePaths = []
        # self.screenShotWg = ScreenShotWidget()
        self.screenShot = None
        self.save_pdf = False
        self.output_dir = None
        self.vis_font_path = os.path.join(root, "doc", "fonts", "simfang.ttf")
        self.use_pdf2docx_api = False

        # ProgressBar
        self.pb = QProgressBar()
        self.pb.setRange(0, 100)
        self.pb.setValue(0)

        # 初始化界面
        self.setupUi()

        # 下载模型
        self.downloadModels(URLs_EN)
        self.downloadModels(URLs_CN)

        # 初始化模型
        predictors = {
            "EN": self.initPredictor("EN"),
            "CN": self.initPredictor("CN"),
        }

        # 设置工作进程
        self._thread = Worker(
            predictors, self.save_pdf, self.vis_font_path, self.use_pdf2docx_api
        )
        self._thread.progressBarValue.connect(self.handleProgressBarUpdateSingal)
        self._thread.endsignal.connect(self.handleEndsignalSignal)
        # self._thread.finished.connect(QObject.deleteLater)
        self._thread.progressBarRange.connect(self.handleProgressBarRangeSingal)
        self._thread.exceptedsignal.connect(self.handleThreadException)
        self.time_start = 0  # save start time

    def setupUi(self):
        self.setObjectName("MainWindow")
        self.setWindowTitle(__APPNAME__ + " " + __VERSION__)

        layout = QGridLayout()

        self.openFileButton = QPushButton("打开文件")
        self.openFileButton.setIcon(QIcon(QPixmap("./icons/folder-plus.png")))
        layout.addWidget(self.openFileButton, 0, 0, 1, 1)
        self.openFileButton.clicked.connect(self.handleOpenFileSignal)

        # screenShotButton = QPushButton("截图识别")
        # layout.addWidget(screenShotButton, 0, 1, 1, 1)
        # screenShotButton.clicked.connect(self.screenShotSlot)
        # screenShotButton.setEnabled(False) # temporarily disenble

        self.startCNButton = QPushButton("中文转换")
        self.startCNButton.setIcon(QIcon(QPixmap("./icons/chinese.png")))
        layout.addWidget(self.startCNButton, 0, 1, 1, 1)
        self.startCNButton.clicked.connect(
            functools.partial(self.handleStartSignal, "CN", False)
        )

        self.startENButton = QPushButton("英文转换")
        self.startENButton.setIcon(QIcon(QPixmap("./icons/english.png")))
        layout.addWidget(self.startENButton, 0, 2, 1, 1)
        self.startENButton.clicked.connect(
            functools.partial(self.handleStartSignal, "EN", False)
        )

        self.PDFParserButton = QPushButton("PDF解析", self)
        layout.addWidget(self.PDFParserButton, 0, 3, 1, 1)
        self.PDFParserButton.clicked.connect(
            functools.partial(self.handleStartSignal, "CN", True)
        )

        self.showResultButton = QPushButton("显示结果")
        self.showResultButton.setIcon(QIcon(QPixmap("./icons/folder-open.png")))
        layout.addWidget(self.showResultButton, 0, 4, 1, 1)
        self.showResultButton.clicked.connect(self.handleShowResultSignal)

        # ProgressBar
        layout.addWidget(self.pb, 2, 0, 1, 5)
        # time estimate label
        self.timeEstLabel = QLabel(("Time Left: --"))
        layout.addWidget(self.timeEstLabel, 3, 0, 1, 5)

        self.setLayout(layout)

    def downloadModels(self, URLs):
        # using custom model
        tar_file_name_list = [
            "inference.pdiparams",
            "inference.pdiparams.info",
            "inference.pdmodel",
            "model.pdiparams",
            "model.pdiparams.info",
            "model.pdmodel",
        ]
        model_path = os.path.join(root, "inference")
        os.makedirs(model_path, exist_ok=True)

        # download and unzip models
        for name in URLs.keys():
            url = URLs[name]
            print("Try downloading file: {}".format(url))
            tarname = url.split("/")[-1]
            tarpath = os.path.join(model_path, tarname)
            if os.path.exists(tarpath):
                print("File have already exist. skip")
            else:
                try:
                    download_with_progressbar(url, tarpath)
                except Exception as e:
                    print("Error occurred when downloading file, error message:")
                    print(e)

            # unzip model tar
            try:
                with tarfile.open(tarpath, "r") as tarObj:
                    storage_dir = os.path.join(model_path, name)
                    os.makedirs(storage_dir, exist_ok=True)
                    for member in tarObj.getmembers():
                        filename = None
                        for tar_file_name in tar_file_name_list:
                            if tar_file_name in member.name:
                                filename = tar_file_name
                        if filename is None:
                            continue
                        file = tarObj.extractfile(member)
                        with open(os.path.join(storage_dir, filename), "wb") as f:
                            f.write(file.read())
            except Exception as e:
                print("Error occurred when unziping file, error message:")
                print(e)

    def initPredictor(self, lang="EN"):
        # init predictor args
        args = parse_args()
        args.table_max_len = 488
        args.ocr = True
        args.recovery = True
        args.save_pdf = self.save_pdf
        args.table_char_dict_path = os.path.join(
            root, "ppocr", "utils", "dict", "table_structure_dict.txt"
        )
        if lang == "EN":
            args.det_model_dir = os.path.join(
                root, "inference", "en_PP-OCRv3_det_infer"  # 此处从这里找到模型存放位置
            )
            args.rec_model_dir = os.path.join(
                root, "inference", "en_PP-OCRv3_rec_infer"
            )
            args.table_model_dir = os.path.join(
                root, "inference", "en_ppstructure_mobile_v2.0_SLANet_infer"
            )
            args.output = os.path.join(root, "output")  # 结果保存路径
            args.layout_model_dir = os.path.join(
                root, "inference", "picodet_lcnet_x1_0_fgd_layout_infer"
            )
            lang_dict = DICT_EN
        elif lang == "CN":
            args.det_model_dir = os.path.join(
                root, "inference", "cn_PP-OCRv3_det_infer"  # 此处从这里找到模型存放位置
            )
            args.rec_model_dir = os.path.join(
                root, "inference", "cn_PP-OCRv3_rec_infer"
            )
            args.table_model_dir = os.path.join(
                root, "inference", "cn_ppstructure_mobile_v2.0_SLANet_infer"
            )
            args.output = os.path.join(root, "output")  # 结果保存路径
            args.layout_model_dir = os.path.join(
                root, "inference", "picodet_lcnet_x1_0_fgd_layout_cdla_infer"
            )
            lang_dict = DICT_CN
        else:
            raise ValueError("Unsupported language")
        args.rec_char_dict_path = os.path.join(
            root, "ppocr", "utils", lang_dict["rec_char_dict_path"]
        )
        args.layout_dict_path = os.path.join(
            root, "ppocr", "utils", "dict", "layout_dict", lang_dict["layout_dict_path"]
        )
        # init predictor
        return StructureSystem(args)

    def handleOpenFileSignal(self):
        """
        可以多选图像文件
        """
        selectedFiles = QFileDialog.getOpenFileNames(
            self, "多文件选择", "/", "图片文件 (*.png *.jpeg *.jpg *.bmp *.pdf)"
        )[0]
        if len(selectedFiles) > 0:
            self.imagePaths = selectedFiles
            self.screenShot = None  # discard screenshot temp image
            self.pb.setValue(0)

    # def screenShotSlot(self):
    #     '''
    #     选定图像文件和截图的转换过程只能同时进行一个
    #     截图只能同时转换一个
    #     '''
    #     self.screenShotWg.start()
    #     if self.screenShotWg.captureImage:
    #         self.screenShot = self.screenShotWg.captureImage
    #         self.imagePaths.clear() # discard openfile temp list
    #         self.pb.setRange(0, 1)
    #         self.pb.setValue(0)

    def handleStartSignal(self, lang="EN", pdfParser=False):
        if self.screenShot:  # for screenShot
            img_name = "screenshot_" + time.strftime("%Y%m%d%H%M%S", time.localtime())
            image = QImageToCvMat(self.screenShot)
            self.predictAndSave(image, img_name, lang)
            # update Progress Bar
            self.pb.setValue(1)
            QMessageBox.information(self, "Information", "文档提取完成")
        elif len(self.imagePaths) > 0:  # for image file selection
            # Must set image path list and language before start
            self.output_dir = os.path.join(
                os.path.dirname(self.imagePaths[0]), "output"
            )  # output_dir shold be same as imagepath
            self._thread.setOutputDir(self.output_dir)
            self._thread.setImagePath(self.imagePaths)
            self._thread.setLang(lang)
            self._thread.setPDFParser(pdfParser)
            # disenble buttons
            self.openFileButton.setEnabled(False)
            self.startCNButton.setEnabled(False)
            self.startENButton.setEnabled(False)
            self.PDFParserButton.setEnabled(False)
            # 启动工作进程
            self._thread.start()
            self.time_start = time.time()  # log start time
            QMessageBox.information(self, "Information", "开始转换")
        else:
            QMessageBox.warning(self, "Information", "请选择要识别的文件或截图")

    def handleShowResultSignal(self):
        if self.output_dir is None:
            return
        if os.path.exists(self.output_dir):
            if platform.system() == "Windows":
                os.startfile(self.output_dir)
            else:
                os.system("open " + os.path.normpath(self.output_dir))
        else:
            QMessageBox.information(self, "Information", "输出文件不存在")

    def handleProgressBarUpdateSingal(self, i):
        self.pb.setValue(i)
        # calculate time left of recognition
        lenbar = self.pb.maximum()
        avg_time = (
            time.time() - self.time_start
        ) / i  # Use average time to prevent time fluctuations
        time_left = str(datetime.timedelta(seconds=avg_time * (lenbar - i))).split(".")[
            0
        ]  # Remove microseconds
        self.timeEstLabel.setText(f"Time Left: {time_left}")  # show time left

    def handleProgressBarRangeSingal(self, max):
        self.pb.setRange(0, max)

    def handleEndsignalSignal(self):
        # enble buttons
        self.openFileButton.setEnabled(True)
        self.startCNButton.setEnabled(True)
        self.startENButton.setEnabled(True)
        self.PDFParserButton.setEnabled(True)
        QMessageBox.information(self, "Information", "转换结束")

    def handleCBChangeSignal(self):
        self._thread.setPDFParser(self.checkBox.isChecked())

    def handleThreadException(self, message):
        self._thread.quit()
        QMessageBox.information(self, "Error", message)


def main():
    app = QApplication(sys.argv)

    window = APP_Image2Doc()  # 创建对象
    window.show()  # 全屏显示窗口

    QApplication.processEvents()
    sys.exit(app.exec())


if __name__ == "__main__":
    main()
